A prerelease demo of Empire at War is available from the link above.

Minimum specs are:

Computer

Required: 100% DirectX 9.0c compatible computer

CPU

Required: Intel Pentium 1.0 GHz or AMD Athlon 1.0 GHz
Recommended: Intel Pentium 4 2.0 GHz or AMD Athlon XP 2.0 GHz

Memory

Required: 256 MB RAM
Recommended: 512 MB RAM

Graphics Card

Required: 32 MB 3D Graphics card with Hardware Transform and Lighting (T&L) Capability
Recommended: 64 MB 3D Graphics card with Hardware Vertex and Pixel Shader (VS/PS) Capability

Sound Card

Required: 100% DirectX 9.0c compatible PCI, USB, or Onboard Audio Device

Input Device

Required: Keyboard and mouse

DirectX

DirectX 9.0c is required and is included in the demo package.
NOTE: DirectX may require the "latest" updates for your operating system. This may also include the latest drivers for your motherboard, sound, and video hardware.

Installation

Installation requires 1.5 GB of free hard drive space. We recommend that you have an additional 500 MB of free space available after installing the game for save games and Windows file caching.